CN113429702B - Corrosion-resistant water supply pipe and preparation method thereof - Google Patents
Corrosion-resistant water supply pipe and preparation method thereof Download PDFInfo
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- CN113429702B CN113429702B CN202110800864.1A CN202110800864A CN113429702B CN 113429702 B CN113429702 B CN 113429702B CN 202110800864 A CN202110800864 A CN 202110800864A CN 113429702 B CN113429702 B CN 113429702B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000005260 corrosion Methods 0.000 title claims abstract description 35
- 230000007797 corrosion Effects 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000012745 toughening agent Substances 0.000 claims abstract description 39
- 229920003225 polyurethane elastomer Polymers 0.000 claims abstract description 24
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 22
- 239000000314 lubricant Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000003381 stabilizer Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000011347 resin Substances 0.000 claims abstract description 14
- 229920005989 resin Polymers 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 10
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims abstract description 9
- XBZSBBLNHFMTEB-UHFFFAOYSA-N cyclohexane-1,3-dicarboxylic acid Chemical compound OC(=O)C1CCCC(C(O)=O)C1 XBZSBBLNHFMTEB-UHFFFAOYSA-N 0.000 claims abstract description 7
- FRGPKMWIYVTFIQ-UHFFFAOYSA-N triethoxy(3-isocyanatopropyl)silane Chemical compound CCO[Si](OCC)(OCC)CCCN=C=O FRGPKMWIYVTFIQ-UHFFFAOYSA-N 0.000 claims abstract description 6
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 15
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000010992 reflux Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002390 rotary evaporation Methods 0.000 claims description 4
- -1 3-isocyanatopropyl Chemical group 0.000 claims description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims 1
- 239000004519 grease Substances 0.000 claims 1
- 229910000077 silane Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 31
- 239000004800 polyvinyl chloride Substances 0.000 description 31
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 229920000728 polyester Polymers 0.000 description 7
- 229920002635 polyurethane Polymers 0.000 description 7
- 239000004814 polyurethane Substances 0.000 description 7
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 239000005662 Paraffin oil Substances 0.000 description 5
- 235000021355 Stearic acid Nutrition 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 5
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 5
- 239000008117 stearic acid Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- MERLDGDYUMSLAY-UHFFFAOYSA-N 4-[(4-aminophenyl)disulfanyl]aniline Chemical compound C1=CC(N)=CC=C1SSC1=CC=C(N)C=C1 MERLDGDYUMSLAY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical group CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 125000001033 ether group Chemical group 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000008029 phthalate plasticizer Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical group C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
- C07F7/1804—Compounds having Si-O-C linkages
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
- C07F7/1804—Compounds having Si-O-C linkages
- C07F7/1872—Preparation; Treatments not provided for in C07F7/20
- C07F7/1892—Preparation; Treatments not provided for in C07F7/20 by reactions not provided for in C07F7/1876 - C07F7/1888
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a corrosion-resistant water supply pipe and a preparation method thereof, and belongs to the technical field of water pipes. The water supply pipe comprises the following raw materials in parts by weight: 45-80 parts of PVC resin powder, 3-7 parts of polyurethane elastomer, 8-22 parts of modified toughening agent, 3.5-9.5 parts of anti-aging agent, 2-4 parts of lubricant and 2.5-9.5 parts of stabilizer. The modified toughening agent is synthesized from pentaerythritol, 1, 3-cyclohexanedicarboxylic acid, 4' -diaminodiphenyl disulfide and 3-isocyanatopropyl triethoxysilane step by step. The polyurethane elastomer and the modified toughening agent are introduced into the PVC base material to replace the micromolecular toughening agent, so that on one hand, the toughness service temperature of the PVC water supply pipe is improved by utilizing the elastic characteristic of the polyurethane elastomer in the wide temperature field, and on the other hand, the toughness and the service temperature of the PVC water supply pipe are further improved by utilizing the modified toughening agent.
Description
Technical Field
The invention belongs to the technical field of water pipes, and particularly relates to a corrosion-resistant water supply pipe and a preparation method thereof.
Background
The water supply pipe is used as a water supply pipeline, and the performance of the water supply pipe is directly related to the quality of water. For example, the traditional galvanized pipe is easy to rust, corrode and scale, and is easy to breed microorganisms, so that secondary pollution is generated, and the human health is threatened. The plastic water supply pipe is not easy to rust, is anti-seepage and anti-burst, has low cost compared with the metal or gold-plated water supply pipe, and has improved performance along with the continuous development of plastic and the modification technology thereof, so that the novel plastic water supply pipe is developed. These factors make plastic water pipes increasingly popular in the market place.
The plastic water supply pipe is mainly composed of three main types of PVC, PE and PP-R pipelines, wherein the PVC water supply pipe is a water supply pipe produced by taking sanitary polyvinyl chloride resin as a main raw material, adding quantitative stabilizers, lubricants, fillers, color enhancers and the like, extruding and molding by a plastic extruder, injection molding by an injection molding machine, cooling, solidifying, shaping, checking, packaging and the like. The PVC water supply pipe has the characteristics of light weight, convenient carrying, loading and unloading, convenient installation, small fluid resistance, smooth inner wall of the pipe, high mechanical strength, excellent acid resistance, alkali resistance and corrosion resistance, good pressure resistance, impact resistance and tensile strength resistance, no influence on water quality and the like.
However, the use temperature of the existing PVC water supply pipe cannot be too high, the toughness and corrosion resistance of the PVC water supply pipe can be greatly reduced due to overheating, and the toughness of the PVC water supply pipe is increased due to the fact that phthalate plasticizer toughening agents are often added in the manufacturing process of the PVC water supply pipe, but the toughening agents are mostly low-molecular-weight compounds or polymers, and the heat stability of the PVC water supply pipe is inevitably reduced due to the fact that the toughening agents are added.
Disclosure of Invention
The invention aims to provide a corrosion-resistant water supply pipe and a preparation method thereof, which are used for solving the technical problem that the service temperature of the existing PVC water supply pipe cannot be too high.
The aim of the invention can be achieved by the following technical scheme:
the corrosion-resistant water supply pipe comprises the following raw materials in parts by weight: 45-80 parts of PVC resin powder, 3-7 parts of polyurethane elastomer, 8-22 parts of modified toughening agent, 3.5-9.5 parts of anti-aging agent, 2-4 parts of lubricant and 2.5-9.5 parts of stabilizer.
Further, the anti-aging agent is an ultraviolet absorber UV-329 and an antioxidant 1010 according to the mass ratio of 1-5: 2-7.
Further, the lubricant is one or a mixture of two of stearic acid and paraffin oil in any ratio.
Further, the polyurethane elastomer is polyester polyurethane 70A.
Further, the modified toughening agent is prepared by the following steps:
step A, adding pentaerythritol and 1, 3-cyclohexanedicarboxylic acid into a three-neck flask with a reflux condenser pipe and a stirring magnet, uniformly stirring, adding p-toluenesulfonic acid, heating to 142 ℃, carrying out melt reaction for 3 hours, cooling to 50 ℃, dissolving with acetone, then precipitating with n-hexane, and carrying out vacuum drying to constant weight to obtain an intermediate 1, and carrying out reaction of carboxyl and hydroxyl, wherein the molar ratio of the pentaerythritol to the 1, 3-cyclohexanedicarboxylic acid is 1:4, the adding mass of the p-toluenesulfonic acid is 2.5-5% of the adding mass of the pentaerythritol; adding the intermediate 1, 4 '-diaminodiphenyl disulfide and DMF into a three-neck flask with a reflux condenser pipe and a stirring magnet, uniformly stirring, and carrying out reflux reaction for 2 hours at 73 ℃ under the protection of nitrogen to obtain the intermediate, wherein the use level ratio of the intermediate 1, 4' -diaminodiphenyl disulfide and DMF is 0.1mol:0.41-0.42mol:50-100mL; the reaction process is shown below;
step B, adding the intermediate 2 and DMF into a three-neck flask with a stirring magnet and a condensing device, then adding 3-isocyanatopropyl triethoxysilane, reacting at the temperature of 56 ℃ under the protection of nitrogen until the NCO variation in a reaction system is less than 0.01%, performing reduced pressure rotary evaporation to obtain a modified toughening agent, and reacting the NCO with amino, wherein the dosage ratio of the intermediate 2, DMF and 3-isocyanatopropyl triethoxysilane is 0.1mol:50-100mL:0.41-0.42mol; the reaction process is shown below;
the preparation method of the corrosion-resistant water supply pipe comprises the following steps:
stirring PVC resin powder, a modified toughening agent, an anti-aging agent, a lubricant and a stabilizer in a stirrer at 100-110 ℃ for 5-15min, cooling to 60-70 ℃, adding a polyurethane elastomer, and stirring for 3-6min to obtain a premix;
step two, melting and mixing the premix by a torque rheometer at 165-175 ℃ and 400-800r/min for 4-8min to obtain a composite material;
step three, feeding the composite material into a double-screw extruder for extrusion molding, sizing, traction and cutting to obtain the corrosion-resistant water supply pipe, wherein the extrusion conditions are as follows: the rotating speed of the screw is 400-700r/min, and the temperature of the machine barrel is set: the feeding section is 160-170 ℃, the plasticizing section is 170-180 ℃, and the discharge temperature of the machine head is 180-195 ℃.
The invention has the beneficial effects that:
for the characteristic that the mechanical strength and corrosion resistance of PVC can be greatly reduced in an overheat environment, the polyurethane elastomer and the modified toughening agent are introduced into the PVC base material to replace a micromolecular toughening agent, on one hand, the toughness service temperature of a PVC water supply pipe is improved by utilizing the elastic characteristic of the wide temperature field of the polyurethane elastomer, and on the other hand, the toughness and the service temperature of the PVC water supply pipe are further improved by utilizing the modified toughening agent due to the hyperbranched structure, the aromatic disulfide bond, the ether group, the secondary amino group and the siloxane chain structure of the modified toughening agent. The principle of improvement of the modified toughening agent is explained as follows: compared with a small molecular toughening agent, the modified toughening agent has the advantages that the relative molecular weight is increased, the thermal stability is better than that of the small molecular toughening agent, the modified toughening agent contains alkyl chain ether groups, the toughening effect is achieved, in addition, the contained aromatic disulfide bonds have the characteristic that dynamic exchange (bond fracture-bond forming reciprocating dynamic process) occurs at room temperature, the characteristic enables chain segment movement driven by the disulfide bonds in the exchange process to bring greater friction internal consumption, and the mechanical energy is converted into heat energy to be dissipated more effectively in the process that the disulfide bonds continuously break bonds to absorb energy and bond to release energy, so that the service temperature of the PVC water supply pipe is improved, and the toughness and corrosion resistance of the PVC water supply pipe are not reduced; on the other hand, the siloxane chain is flexible and flexible, and is easy to wind with polyurethane elastomer and PVC molecular chain in the system to generate hydrogen bond action, and the hyperbranched structure of the modified toughening agent provides a repeating unit on the molecular structure for the winding and the hydrogen bond action, so that an interpenetrating network structure is finally formed, the stability of the system is improved, and the corrosion resistance of PVC water supply is improved; and the modified toughening agent contains secondary amino groups, can generate free radicals, has an anti-aging effect, and can improve the service temperature of the PVC water supply pipe.
In summary, the anti-corrosion water supply pipe provided by the invention has excellent toughness and corrosion resistance.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
the modified toughening agent is prepared by the following steps:
step A, adding 0.2mol of pentaerythritol and 0.8mol of 1, 3-cyclohexanedicarboxylic acid into a three-neck flask with a reflux condenser pipe and a stirring magnet, uniformly stirring, adding 1.2g of p-toluenesulfonic acid, heating to 142 ℃, carrying out melt reaction for 3 hours, cooling to 50 ℃, dissolving with acetone, then precipitating with n-hexane, and carrying out vacuum drying to constant weight to obtain an intermediate 1; adding 0.1mol of intermediate 1, 0.41mol of 4,4' -diaminodiphenyl disulfide and 50ml of LDMF into a three-neck flask with a reflux condenser pipe and a stirring magnet, uniformly stirring, and carrying out reflux reaction for 2 hours at 73 ℃ under the protection of nitrogen to obtain;
and B, adding 0.1mol of the intermediate 2 and 50ml of LDMF into a three-neck flask with a stirring magnet and a condensing device, then adding 0.41mol of 3-isocyanatopropyl triethoxysilane, reacting under the protection of nitrogen at 56 ℃ until the NCO variation in a reaction system is less than 0.01%, and performing reduced pressure rotary evaporation to obtain the modified toughening agent.
Example 2:
the modified toughening agent is prepared by the following steps:
step A, adding 0.1mol of pentaerythritol and 0.4mol of 1, 3-cyclohexanedicarboxylic acid into a three-neck flask with a reflux condenser pipe and a stirring magnet, uniformly stirring, adding 0.34g of p-toluenesulfonic acid, heating to 142 ℃, carrying out melt reaction for 3 hours, cooling to 50 ℃, dissolving with acetone, then precipitating with n-hexane, and carrying out vacuum drying to constant weight to obtain an intermediate 1; adding 0.1mol of intermediate 1, 0.42mol of 4,4' -diaminodiphenyl disulfide and 100ml of LDMF into a three-neck flask with a reflux condenser pipe and a stirring magnet, uniformly stirring, and carrying out reflux reaction for 2 hours at 73 ℃ under the protection of nitrogen to obtain;
and B, adding 0.1mol of the intermediate 2 and 100ml of LDMF into a three-neck flask with a stirring magnet and a condensing device, then adding 0.42mol of 3-isocyanatopropyl triethoxysilane, reacting under the protection of nitrogen at 56 ℃ until the NCO variation in a reaction system is less than 0.01%, and performing reduced pressure rotary evaporation to obtain the modified toughening agent.
Example 3:
the corrosion-resistant water supply pipe comprises the following raw materials in parts by weight:
45 parts of PVC resin powder, 3 parts of polyurethane elastomer, 8 parts of modified toughening agent prepared in example 1, 3.5 parts of anti-aging agent, 2 parts of lubricant and 2.5 parts of stabilizer; the anti-aging agent is an ultraviolet absorber UV-329 and an antioxidant 1010 according to the mass ratio of 1:2, a mixture to be mixed; the lubricant is stearic acid; the polyurethane elastomer is polyester polyurethane 70A.
The preparation method of the corrosion-resistant water supply pipe comprises the following steps:
stirring PVC resin powder, a modified toughening agent, an anti-aging agent, a lubricant and a stabilizer in a stirrer at 100 ℃ for 5min, cooling to 60 ℃, adding a polyurethane elastomer, and stirring for 3min to obtain a premix;
step two, melting and mixing the premix by a torque rheometer at 165 ℃ and 400r/min for 4min to obtain a composite material;
step three, conveying the composite material into a double-screw extruder for molding, sizing, traction and cutting to obtain the corrosion-resistant water supply pipe, wherein the extrusion conditions are as follows: screw rotation speed is 500r/min, and barrel temperature is set: the feeding section is 160 ℃, the plasticizing section is 170 ℃, and the discharge temperature of the machine head is 180 ℃.
Example 4:
the corrosion-resistant water supply pipe comprises the following raw materials in parts by weight:
60 parts of PVC resin powder, 5 parts of polyurethane elastomer, 13 parts of modified toughening agent prepared in example 2, 7 parts of anti-aging agent, 3 parts of lubricant and 7 parts of stabilizer; the anti-aging agent is an ultraviolet absorber UV-329 and an antioxidant 1010 according to the mass ratio of 2:5, a mixture to be mixed; the lubricant is paraffin oil; the polyurethane elastomer is polyester polyurethane 70A.
The preparation method of the corrosion-resistant water supply pipe comprises the following steps:
stirring PVC resin powder, a modified toughening agent, an anti-aging agent, a lubricant and a stabilizer in a stirrer at 110 ℃ for 15min, cooling to 60-70 ℃, adding a polyurethane elastomer, and stirring for 3-6min to obtain a premix;
step two, melting and mixing the premix by a torque rheometer at 170 ℃ and 500r/min for 5min to obtain a composite material;
step three, conveying the composite material into a double-screw extruder for molding, sizing, traction and cutting to obtain the corrosion-resistant water supply pipe, wherein the extrusion conditions are as follows: screw rotation speed is 500r/min, and barrel temperature is set: the feeding section is 170 ℃, the plasticizing section is 180 ℃, and the discharge temperature of the machine head is 190 ℃.
Example 5:
the corrosion-resistant water supply pipe comprises the following raw materials in parts by weight:
80 parts of PVC resin powder, 7 parts of polyurethane elastomer, 22 parts of modified toughening agent prepared in example 1, 9.5 parts of anti-aging agent, 4 parts of lubricant and 9.5 parts of stabilizer; the anti-aging agent is an ultraviolet absorber UV-329 and an antioxidant 1010 according to the mass ratio of 5:7, a mixture to be mixed; the lubricant is stearic acid and paraffin oil according to the mass ratio of 1:1, mixing and combining; the polyurethane elastomer is polyester polyurethane 70A.
The preparation method of the corrosion-resistant water supply pipe comprises the following steps:
stirring PVC resin powder, a modified toughening agent, an anti-aging agent, a lubricant and a stabilizer in a stirrer at 100 ℃ for 15min, cooling to 60 ℃, adding a polyurethane elastomer, and stirring for 6min to obtain a premix;
step two, melting and mixing the premix by a torque rheometer at 175 ℃ and 800r/min for 4min to obtain a composite material;
step three, feeding the composite material into a double-screw extruder for extrusion molding, sizing, traction and cutting to obtain the corrosion-resistant water supply pipe, wherein the extrusion conditions are as follows: screw rotation speed is 700r/min, and barrel temperature is set: the feeding section is 160 ℃, the plasticizing section is 170 ℃, and the discharge temperature of the machine head is 180 ℃.
Comparative example 1:
the corrosion-resistant water supply pipe comprises the following raw materials in parts by weight:
45 parts of PVC resin powder, 3 parts of polyurethane elastomer, 8 parts of plasticizer, 3.5 parts of anti-aging agent, 2 parts of lubricant and 2.5 parts of stabilizer; the anti-aging agent is an ultraviolet absorber UV-329 and an antioxidant 1010 according to the mass ratio of 1:2, a mixture to be mixed; the lubricant is stearic acid; the polyurethane elastomer is polyester polyurethane 70A, and the toughening agent is dibutyl phthalate.
The preparation method of the corrosion-resistant water supply pipe comprises the following steps: reference is made to the steps in example 1.
Comparative example 2:
the corrosion-resistant water supply pipe comprises the following raw materials in parts by weight:
60 parts of PVC resin powder, 13 parts of modified toughening agent prepared in example 2, 7 parts of anti-aging agent, 3 parts of lubricant and 7 parts of stabilizer; the anti-aging agent is an ultraviolet absorber UV-329 and an antioxidant 1010 according to the mass ratio of 2:5, a mixture to be mixed; the lubricant is paraffin oil; the polyurethane elastomer is polyester polyurethane 70A.
The preparation method of the corrosion-resistant water supply pipe comprises the following steps: reference is made to the steps in example 4.
Comparative example 3:
the corrosion-resistant water supply pipe comprises the following raw materials in parts by weight:
80 parts of PVC resin powder, 22 parts of plasticizer, 9.5 parts of anti-aging agent, 4 parts of lubricant and 9.5 parts of stabilizer; the anti-aging agent is an ultraviolet absorber UV-329 and an antioxidant 1010 according to the mass ratio of 5:7, a mixture to be mixed; the lubricant is stearic acid and paraffin oil according to the mass ratio of 1:1, mixing and combining; the polyurethane elastomer is polyester polyurethane 70A, and the plasticizer is triphenyl phosphate.
The preparation method of the corrosion-resistant water supply pipe comprises the following steps: reference is made to the steps in example 5.
Example 6:
the corrosion resistant water supply pipes obtained in examples 3 to 5 and comparative examples 1 to 3 were subjected to the following performance tests:
the Vicat soft temperature, hydraulic performance test, drop hammer impact performance, longitudinal retraction rate and dichloromethane dipping test are carried out according to the requirements of GB/T5836.1-2006 rigid polyvinyl chloride (PVC-U) pipe for building drainage.
The Vicat soft temperature is tested according to GB/T8802-2001; the hydraulic performance is tested according to national standard GB/T6111-2003; drop hammer impact performance was tested according to GB/T14152-2001; the longitudinal retraction rate was tested according to GB/T6671-2001; the methylene chloride impregnation test was carried out in accordance with GB/T13526-1992. The test results are shown in Table 1.
TABLE 1
As can be seen from the data in Table 1, the performance of the water supply pipes obtained in examples 3 to 5 is superior to the corresponding performance of the water supply pipes obtained in comparative examples 1 to 3.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (3)
1. The corrosion-resistant water supply pipe is characterized by comprising the following raw materials in parts by weight: PVC tree
45-80 parts of grease powder, 3-7 parts of polyurethane elastomer, 8-22 parts of modified toughening agent, 3.5-9.5 parts of anti-aging agent, 2-4 parts of lubricant and 2.5-9.5 parts of stabilizer;
the modified toughening agent is prepared by the following steps:
step A, mixing pentaerythritol and 1, 3-cyclohexanedicarboxylic acid, adding p-toluenesulfonic acid, and heating
Carrying out melt reaction for 3 hours at 142 ℃ to obtain an intermediate 1; mixing the intermediate 1, 4' -diaminodiphenyl disulfide and DMF, and carrying out reflux reaction for 2 hours at 73 ℃ under the protection of nitrogen to obtain an intermediate 2;
step B, mixing intermediate 2 with DMF and then adding 3-isocyanatopropyl triethoxy
Reacting the silane under the protection of nitrogen at 56 ℃ until the NCO variation in the reaction system is less than 0.01%, and performing rotary evaporation under reduced pressure to obtain a modified toughening agent;
the molar ratio of pentaerythritol to 1, 3-cyclohexanedicarboxylic acid in step A was 1:4, the adding mass of the p-toluenesulfonic acid is 2.5-5% of the adding mass of the pentaerythritol;
the ratio of the amount of intermediate 1, 4' -diaminodiphenyl disulfide to DMF in step A was 0.1mol:0.41-0.42mol:50-100mL;
the ratio of the amount of intermediate 2, DMF, 3-isocyanatopropyl triethoxysilane used in step B was 0.1mol:50-100mL:0.41-0.42mol.
2. The method for preparing a corrosion resistant water supply pipe as claimed in claim 1, wherein
The method comprises the following steps:
step one, PVC resin powder, a modified toughening agent, an anti-aging agent, a lubricant and a stabilizer are mixed in a reactor
Stirring in a stirrer at 100-110deg.C for 5-15min, cooling to 60-70deg.C, adding polyurethane elastomer, stirring for 3-6min to obtain premix;
step two, melting and mixing the premix by a torque rheometer at 165-175 ℃ for 4-8min to obtain
To composite materials;
step three, feeding the composite material into a double-screw extruder for extrusion molding, sizing, traction and cutting
After cutting, a corrosion-resistant water supply pipe is obtained.
3. The method for preparing the corrosion-resistant water supply pipe as claimed in claim 2, wherein the method comprises the steps of
In the third step, the rotating speed of the screw is 400-700r/min, and the temperature of the machine barrel is set: the feeding section is 160-170 ℃, the plasticizing section is 170-180 ℃, and the discharge temperature of the machine head is 180-195 ℃.
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| CN101184721A (en) * | 2005-05-27 | 2008-05-21 | 埃克森美孚化学专利公司 | Plasticiser esters |
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Application publication date: 20210924 Assignee: ANHUI YUFA PLASTIC INDUSTRY Co.,Ltd. Assignor: ANQING YUEFA PIPE INDUSTRY CO.,LTD. Contract record no.: X2023980042968 Denomination of invention: A corrosion-resistant water supply pipe and its preparation method Granted publication date: 20230620 License type: Common License Record date: 20231011 |